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1) wave a) hand-held device with a magnetic needle used to find magnetic north. b) an instrument that measures the magnetic field intensity. c) process by which something takes place. d) a change in the shape of water caused by energy from wind. 2) map a) hand-held device with a magnetic needle used to find magnetic north. b) an instrument that measures the magnetic field intensity. c) a two-dimensional representation, usually of some part of Earth's surface. d) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. 3) trenches a) hand-held device with a magnetic needle used to find magnetic north. b) a deep gash in the seafloor; the deepest places on Earth. c) process by which something takes place. d) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. 4) basins a) a large area, usually below sea level, that collects sediments due to being bowl shaped. b) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. c) process by which something takes place. d) an instrument that measures the magnetic field intensity. 5) elevation a) height of a feature measured relative to sea level. b) rock that originates in a volcano or volcanic feature, formed from lava or magma. c) process by which something takes place. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 6) mid-ocean ridge a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a large, continuous mountain range found within an ocean basin; it is the location on the seafloor where magma upwells and forms new seafloor. c) process by which something takes place. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 7) active volcanoes a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) a volcano that has had at least one eruption within the past 10,000 years. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 8) sea level a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) the average height of the ocean; the midpoint between high and low tide. 9) continental margin a) submerged, outer edge of the continent; it is the transition zone from land to deep sea where continental crust gives way to oceanic crust. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 10) continental crust a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 11) ocean basin a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) areas covered by ocean water; the three major ocean basins are the Pacific, Atlantic, and Indian. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 12) seafloor spreading a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) the mechanism for moving continents; the formation of new seafloor at spreading ridges pushes lithospheric plates on the Earth's surface. c) areas covered by ocean water; the three major ocean basins are the Pacific, Atlantic, and Indian. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes.

Bathymetric Evidence for Seafloor Spreading

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